Lubricant composition



United States Patent LUBRICANT COMPOSITION Robert F. McKibben and AlvinH. Lipton, Dayton,

Ohio, assignors to The National Cash Register Company, Dayton, Ohio, acorporation of Maryland No Drawing. Filed Feb. 25, 1958, Ser. No.717,296

2 Claims. (Cl. 252-35) small amount of a metallic soap, such as aluminumstearate, to control the 'dropping point of the lubricant.

The wax fraction, in an amount of 18%, by weight, mixed with thementioned oil in an amount of 78%, by weight, of oil and 4%, by weight,of aluminum stearate, forms a grease which will not pour until itreaches a temperature of about 180 degrees Fahrenheit and still maintainits lubricating characteristics at 0 degree Fahrenheit.

Heretofore, the aforesaid intricate mechanisms have been disabled bybinding of the parts due to increased viscosity of the lubricant at lowtemperatures or by the dropping of the lubricant from the bearingsurfaces at relatively high temperatures.

If it is desired to have a liquid lubricant that can be sprayed orotherwise applied to the mechanism, as by dipping, or by dropping theliquid froman oil-can, the foregoing compound may be dissolved in anevaporable solvent, suoh as a low-boiling petroleum fraction, carbontetrachloride, toluene, and equivalents.

The specific example so far given may be dissolved with an equal volumeof a solvent which is a petroleum fraction having a boiling range offrom 300 to 400 degrees Fahrenheit.

The liquid product will revert to the grease as soon as the solvent hasevaporated, leaving it at the desired points of the mechanism in itspreferred form.

As an example of preparing the wax fraction of the grease, 10 parts, byweight, of the micro-crystalline wax is dissolved in 90 parts, byweight, of xylol, and 100 parts, by weight, of the resulting solutionhas dispersed therein 40 parts, by weight, of finely-divided ureacrystals (which ice solution, the temperature being held below themelting.

point of the urea.

To the stirred mixture is added, by weight, 2 to 5 parts of water orsimilar solvent for the urea to aid it in combining with thestraight-chain components of the microorystalline wax to the exclusionof the non-straight-chain components of said wax, the latter being thefraction of the wax that it is desired to keep. The result is acrystalline powder xylol dispersion of the urea-modified straightchainfraction of the original wax with any unused or excess of the urea. Thenon-straight-chain fractions of the original wax remain dissolved in thexylol. The dissolved non-straight-chain fractions of the original waxare separated by filtration and evaporation of the solvent from thefiltrate. v

So far, preferred forms of the lubricant and their preparation have beendescribed. However, the principal improvement in the lubricant is causedby the elimination of the straight-chain fractions of themicro-crystalline wax and the use of the remaining non-straight-chainfractions with selected amounts of a compatible oil as desired toprovide for easy application, and selected amounts of a flow-resistantagent such as the metallic soaps.

What is claimed is:

1. A lubricant composition consisting of a mixture of the followingingredients, in parts, by weight:

Petroleum oil having a viscosity of approximately 150 Saybolt Universalseconds at degrees Fahrenheit 78 Non-straight chain fractions ofmicro-crystalline petroleum wax 18 Aluminum stearate 4 2. The lubricantcomposition of claim 1 dissolved in at least an equal amount ofpetroleum distillate having a boiling point range of from 300 to 400degrees Fahrenheit at atmospheric pressure.

References Cited in the file of this patent UNITED STATES PATENTS

1. A LUBRICANT COMPOSITION CONSISTING OF A MIXTURE OF THE FOLLOWINGINGREDIENTS, IN PARTS, BY WEIGHT: